Steps in Applying ROTH

To run ROTH, it is necessary to prepare a series of input files that contain climate, soil and land management information. The running of the model involves the following steps:

Step 1: Input climate data such as monthly mean temperature, total monthly precipitation and total monthly open pan evaporation

Step 2: Input soil data such as percentage of clay in soil and soil depth Step 3: Input land management data related to carbon simulation

° Monthly inputs of organic matter to soil

° Plant residues (tC/ha) added monthly

° Farmyard manure (tC/ha) added monthly

° Soil cover (covered/fallow)

Step 4: Parameterize the mode! by running the model itself using varied additions of organic matter input to soil to achieve equilibrium

° Values of soil organic carbon present in soil

Step 5: Run the model for parameterization

° Select the time period

Step 6: Run the Roth C model for generating soil carbon dynamics Step 7: Note the soil carbon dynamics outputs

° Carbon dynamics outputs under "current conditions scenario" of soil, climate and management for the selected time period ° Carbon dynamics outputs under the "new management scenario" such as a mitigation scenario

15.3 Conclusions

The models described in this chapter could be applied for projecting changes in carbon stock at the project or national level. The models are particularly required for projecting changes in carbon stocks or roundwood production during the project development phase as well as during the earlier periods of post-implementation phase. The selection of the model depends on the following:

• Objective of the programme, such as

(i) Estimation or projection of changes in carbon stock due to mitigation project activities

(ii) Estimation of carbon emissions and removals for greenhouse gas inventory

(iii) Estimation or projection of industrial roundwood or fuelwood

(iv) Understanding the carbon dynamics

• Input data availability for the model

• Accuracy required

• Access to model and suitability of the model to the location, land category or project activity

Among the models described in this chapter, biomass estimation equations are extensively used for most mitigation and roundwood production projects as well as for estimations related to national greenhouse gas inventories. Models will be increasingly used for mitigation projects, greenhouse gas inventories and round-wood production programmes. The use of models is becoming increasingly important and some of the models are being recommended for afforestation and reforestation projects under the CDM of the Kyoto Protocol. Very often, the application of models is limited by the availability of input data. Care should be taken in selecting the model, since all models have some limitations due to the assumptions and the relationships developed between various input and output variables.

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